K.R.L. Petersen & Jørg. Koch, Mycological


Sordariomycetes, Subclass Hypocreomycetidae






Anisostagma K.R.L. Petersen & Jørg. Koch, Mycological Research 100: 209 (1996)

Type and marine species:

Anisostagma rotundatum K.R.L. Petersen & Jørg. Koch, Mycological Research 100: 211 (1996)

Index Fungorum number: 414610                          Faceoffungi number: N/A

Saprobic on wood, sexual morph: Ascomata: solitary or gregarious, globose to broadly ellipsoidal, (180) 240-450 µm diam., (200) 280-460 µm high to base of neck, immersed or partly immersed, coriaceous, cream-coloured to light brown, ostiolate with a neck. Peridiurn: 30-55 µm thick, two-layered. Inner layer composed of flattened thin-walled cells, outer cells forming a textura angularis. Neck: 140-420 x 30-60 µm, cylindrical, periphyses septate with slightly swollen end cells. Asci: 137-175 x 37-45 µm (17 mature asci), eight-spored, pedunculate, clavate, unitunicate, thin-walled, early deliquescing, without an apical apparatus, developing from a small cushion at the base of the ascoma venter. Catenophyses: Present. Ascospores: 22-27.1-32 x 20-22.6-25 µm (41 spores), one-celled, globose to ellipsoidal, hyaline, thin-walled, smooth, without appendages or gelatinous sheaths, with one large globule surrounded by numerous droplets most prominent at the poles. Whitish mycelium developed on culture substrate but no conidial states were observed. Asexual morph: Undermined.

Description from Petersen & Koch (1996).


Key references:

Jones EBG, Sakayaroj J, Sueterong S, Somrithipol A, Pang KL (2009. Classification of marine Ascomycota, anamorphic taxa and Basidiomycota. Fungal Divers 35: 1–187.

Petersen KRL, Koch J (1996). Anisostagma rotundatum gen. et sp. nov., a lignicolous marine ascomycete from Svanemøllen Harbour in Denmark. Mycological Research. 100: 209–212.

Wijayawardene NN, Hyde KD, Rajeshkumar KC, Hawksowrth DL, Madrid H et al. (2017). Notes for genera: Ascomycota. Fungal Diversity 86: 1–594.

Type & Location:
Other Specimens:
Saprobic wood, mooring posts of oak.
Denmark, Taiwan.
Pertinent Literature:
Description from Petersen & Koch (1996).
NOTES: Anisostagma rotundaturn is assigned to the Halosphaeriaceae because of the early deliquescing, thin–walled asci, the presence of catenophyses and the occurrence in the marine habitat. Anisostagma rotundaturn most closely resemble Thalassogena sphaerica and Iwilsoniella rotunda because of the similar morphology of the ascospores. The three species all have sphericaI–ellipsoida1 ascospores which are hyaline and contain one large globule surrounded by small droplets. Ascospores from the three species revealed no signs of appendages or sheaths at the light microscope level. No cultures or sequence data are available for this ascomycete, recollection, isolation and sequencing is require to confirm its placement in the Halosphaeriaeae. Accepted by Jones et al. (2015) and Wijayawardene et al. (2017).


Mushroom Research Foundation 
Chiang Rai 


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